Control Techniques Focus 3N Users Manual

Focus 3N

¼ to 5HP Single Phase, Uni-Directional

Non-Regenerative DC Drive

User Guide

P/N: FOCUS3N-UG

Revision: A1

Date: May 21, 2004

© Control Techniques Drives, Inc. 2004

Page i

General Information

The manufacturer accepts no liability for any consequences resulting from
inappropriate, negligent or incorrect installation or adjustment of the optional operating
parameters of the equipment or from mismatching the variable speed drive with the
motor.

The contents of this User Guide are believed to be correct at the time of printing. In the
interests of a commitment to a policy of continuous development and improvement, the
manufacturer reserves the right to change the specifications of the product or its
performance, or the contents of the User Guide, without notice.

All rights reserved. No parts of this User Guide may be reproduced or transmitted in any
form or by any means, electrical or mechanical, without permission in writing from
Control Techniques.

Page ii

Customer Support

Control Techniques
359 Lang Boulevard, Building B
Grand Island, New York 14072
U.S.A. Telephone: [phone]

It is Control Techniques’ goal to ensure your greatest possible satisfaction with the
operation of our products. We are dedicated to providing fast, friendly, and accurate
assistance. That is why we offer you so many ways to get the support you need.
Whether it’s by phone, fax or modem, you can access Control Techniques support
information 24 hours a day, seven days a week. Our wide range of services include:

Fax [phone]

You can FAX questions and comments to Control Techniques Just send a FAX to the
number listed above.

Website and Email www.emersonct.com

Website: www.emersonct.com

Email: [e-mail]

If you have Internet capabilities, you also have access to technical support using our
website. The website includes technical notes, frequently asked questions, release
notes and other technical documentation. This direct technical support connection lets
you request assistance and exchange software files electronically.

Technical Support [phone] or [phone]

Email: [e-mail]

Control Techniques’ products are backed by a team of professionals who will service
your installation. Our technical support center in Grand Island New York is ready to help
you solve those occasional problems over the telephone. Our technical support center
is available 24 hours a day for emergency service to help speed any problem solving.
Also, all hardware replacement parts, if needed, are available through our customer
service organization.
When you call, please be prepared to provide the following information:

The type of controller or product you are using
What you were doing when the problem occurred

How you tried to solve the problem
Need on-site help? Control Techniques provides service, in most cases, the next day.
Just call Control Techniques’ technical support center when on-site service or
maintenance is required.

Customer Service [phone] or [phone]

Email: [e-mail]

Authorized Control Techniques distributors may place orders directly with our Customer
Service department. Contact the Customer Service department at this number for the
distributor nearest you.

Page iii

“Warning” indicates a potentially hazardous situation that, if

not avoided, could result in death or serious injury.

“Caution” indicates a potentially hazardous situation that, if

not avoided, may result in minor or moderate injury.

“Caution” used without the safety alert symbol indicates a
potentially hazardous situation that, if not avoided, may result in property
damage.

Page iv

Safety Considerations

Safety Precautions

This product is intended for professional incorporation into a complete system. If
you install the product incorrectly, it may present a safety hazard. The product
and system may use high voltages and currents, carry a high level of stored
electrical energy, or are used to control mechanical equipment that can cause
injury.

You should give close attention to the electrical installation and system design to
avoid hazards either in normal operation or in the event of equipment
malfunction. System design, installation, commissioning and maintenance must
be carried out by personnel who have the necessary training and experience.
Read and follow this safety information and instruction manual carefully.

Enclosure

This product is intended to be mounted in an enclosure that prevents access
except by trained and authorized personnel and prevents the ingress of
contamination. This product is designed for use in an environment classified as
pollution degree 2 in accordance with IEC664-1. This means that only dry, non­conducting contamination is acceptable.

Setup, Commissioning and Maintenance

It is essential that you give careful consideration to changes to drive settings.
Depending on the application, a change could have an impact on safety. You
must take appropriate precautions against inadvertent changes or tampering.
Restoring default parameters in certain applications may cause unpredictable or
hazardous operation.

Safety of Machinery

Within the European Union all machinery in which this product is used must
comply with Directive 89/392/EEC, Safety of Machinery.

The product has been designed and tested to a high standard, and failures are
very unlikely. However the level of integrity offered by the product’s control
function – for example stop/ start, forward/reverse and maximum speed – is not
sufficient for use in safety-critical applications without additional independent
channels of protection. All applications where malfunction could cause injury or
loss of life must be subject to a risk assessment, and further protection must be
provided where needed.

Page v

General warning

Failure to follow safe installation guidelines can cause death or serious injury. The
voltages used in this unit can cause severe electric shock and/or burns, and could be
lethal. Extreme care is necessary at all times when working with or adjacent to this
equipment. The installation must comply with all relevant safety legislation in the country
of use.

AC supply isolation device

The AC supply must be removed from the drive using an approved isolation device or
disconnect before any servicing work is performed, other than adjustments to the
settings or parameters specified in the manual. The drive contains capacitors, which
remain charged to a potentially lethal voltage after the supply has been removed.

Grounding (Earthing, equipotential bonding)

The drive must be grounded by a conductor sufficient to carry all possible fault current
in the event of a fault. The ground connections shown in the manual must be followed.

Fuses

Fuses or over-current protection must be provided at the input in accordance with the
instructions in the manual.

Isolation of control circuits

The installer must ensure that the external control circuits are isolated from human
contact by at least one layer of insulation rated for use at the applied AC supply voltage.

Page vi

Page vii

Table of Contents

Topic Page

Introduction 4
Motor Compatibility 5
Eddy Current Clutch Control 6
Basic Control Modes/Feedback 7

Armature Voltage Feedback 7
Speed or Tach Feedback 7

Quick Stops 7
Receiving, Inspection, Storing 8
Performance Features 9
Nameplate Information 10
Nameplate Location 10
Catalog Number Definition 10

Specifications Ratings Table 11

Performance Specifications 12
Operating Conditions 12

Internal Adjustments (Potentiometer) 12
Customer Selections (Jumpers) 12
Operator Functions 13
Control Circuit Specifications 13
Options 13
Dimensions 14-15
Option Kits & Descriptions 16-20

Customer Connections & Start-Up

Start-Up Guidelines 21
Incoming Power Requirements 22
Grounding 22
Motor Wiring 22-23

When viewing this document electronically, the Table of Content items are active and

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Page 2

Table of Contents

Topic Page

Power Wiring 24-25

Control Wiring 26-33

Speed Pot Wiring 33

Customer Selections

Jumper Programming 34-38

Current Ranges 35

Current/Torque Control 35
LED Status Indicators 39
Potentiometer Adjustments 40-46

Basic Adjustments 41-42

Tuning Adjustments 43-44

Interconnect Drawings

Functional Block Diagram 47
Non-Regen Circuit Overview 48

Start-up Guide Worksheet 49-51

Initial Start-Up & Basic Test Setups 52

Installation of Option Kits 52

Motor Test 53-55

Trouble Shooting Guide 56-59

Light Bulb Test 60-61

Retrofitting Focus 3 to Focus 2 Applications 62-64

Application Notes 65

Tachometer Follower Application 66-67
Drive Isolation 68-72

Spare Parts 73

When viewing this document electronically, the Table of Content items are active and
will direct you to that topic by clicking on that item.

Page 3

Introduction

This is the User’s Guide for Focus 3N (Non-regenerative) series of DC Drives. The Focus
3 is a 3rd generation product of the long-standing Focus series. The Focus 1 was introduced
back in 1980 and the Focus 2 later in 1982. The Focus 2 was retired when the Focus 3 was
introduced as it took advantage of many technological advances in power electronics. The
Focus 3 Non-regen is a single-phase, uni-directional analog drive for DC motors with power
ranges from ¼ to 5HP.

Your Focus 3N is a general purpose non-regenerative DC motor speed controller that is
powered from either 115Vac or 230Vac single phase power. A non-regenerative (single
quadrant) drive is one that can provide motoring torque for acceleration and to overcome rated
loads. There are a great many applications where non-regenerative drives provide the most
economical solution. A non-regenerative drive however cannot slow down a motor faster than
the motors normal coasting rate (unless a Dynamic Braking stop is commanded) nor can it stop
overhauling load situations. For more demanding applications, a sister drive- the Focus 3
Regen (regenerative model), offers full four quadrant operation for bi-directional motor control
and controlled deceleration as well as opposition to overhauling loads.

Both drives incorporate many features that are standard on high performance system
drives, such as dynamic stability and built-in signal follower adjustments. Focus 3 drives come
in two basic model variations- with and without enclosure

.

Chassis Model

The model without an enclosure is denoted as a chassis model.
The chassis model is intended for mounting within a User
supplied cabinet and where the User intends to provide remote

Start/Stop and Speed control signals.

Enclosed Model

The Enclosed version comes to you already in a NEMA 4/12
enclosure that would allow the User to mount the Focus on a wall
or machine surface. The Enclosed version has Start/Stop and the
Speed Control adjustment on the front cover for convenient
operation.

For a complete overview of the Focus 3 product
line and available options, visit our website at:

www.emersonct.com or click the link below:

Focus 3 Catalog Section

Page 4

Motor Compatibility

The Focus 3 was designed to run standard 90 Vdc or 180 Vdc Shunt Wound or Permanent
Magnet DC motors in one direction. The Focus 3 can run motors with other characteristics
(such as Universal motors) but one must review those requirements to insure compatibility.
Universal motors have commutator brushes but typically plug into the AC power line. Universal
motors are often used in tools such as Drills, Saws, Shop VAC’s, Routers, etc and typically
cannot be run in reverse.

Shunt Wound Motors that are controlled by single phase DC drives typically have 4 power
wires. Two of these are the Armature leads typically designated A1 & A2 or A+ & A-. The
other two power wires are the shunt field leads and typically designated F1 & F2 or F+ & F-.
The Focus 3 can supply up to 1 Amp for shunt field excitation (field current requirements
beyond 1A may damage field rectifier diodes). If your motor does not have Field Current
information on the nameplate, you can determine compatibility by measuring your motors Field
resistance using a calibrated ohmmeter.

Motors with:

90v Armatures typically require 100 Vdc for field excitation. In these cases, the Focus

3 requires 120vac input power and must be internally set for this input level. The motor
Field resistance should not be less than 100 ohms when cold.

180v Armatures typically require 200 Vdc for field excitation. In these cases, the Focus
3 requires 240vac input power and must be internally set for this input level. The motor
Field resistance should not be less than 200ohms when cold.

240v Armatures typically require 150 Vdc for field excitation. In these cases, the Focus
3 requires 240vac input power and must be internally set for this input level. The motor
field resistance should not be less than 150 ohms when cold and will require a series
resistor to drop the additional field supply voltage. Consult Control Techniques Technical
Support for additional information.

Motors with:

Permanent Magnet Motors typically have only 2 power wires. These are the Armature

leads and typically designated A1 and A2 or A+ and A-.

Page 5

Eddy Current Clutch Controls

Focus 3 Non-Regenerative Drives have been used to replace many of our old Eddy
Current Clutch Drive units. To regulate speed the clutch output shaft typically employed
a tachometer (typically AC but DC could also be used)

A Replacement Solution

for 1235 / 367 Eddy Current Controllers

F3N2C-EC

The Eddy Current controls were a very popular means of providing variable speed
control of a machine back in the 1970’s. A simple 10-amp eddy current controller could
actually control the speed/torque of a 900 HP motor. The F3N2C-EC can provide coil
current up to 10 amps dc in 5 ranges starting at 2.7amps by setting a programming
jumper. This current level can be “fine tuned” to the exact coil current of the clutch being
controlled. For more specific information, refer to CTAN213 via the Internet at our
website: www.emersonct.com or click the link below:

CTAN213

Current 367

Page 6

WER Eddy

Controller

Emerson Eddy

Current 1235

Controller

Control Techniques

Focus Eddy Current

Controller

-

Speed Control

Armature Voltage Feedback

The Focus 3 can vary the speed of the motors mentioned above as a function of the
Speed potentiometer setting (or external speed command signal) by simply varying the
output Armature voltage (field excitation if used typically remains constant). A great
many motor applications do not require ultra precise speed control. Because of this, the
Focus 3 is factory set for Armature Voltage Feedback. Armature Voltage Feedback (or
simply Armature Feedback) does not require any special motor mounted speed
feedback device and is therefore inherently quite reliable and is capable of providing up
to 1% speed regulation.

Speed Feedback- Tachometer

Should more precise speed control be required, the Focus 3 can accommodate those
motors equipped with DC Tachometers (AC tachometers require an option kit). DC
tachometers output a linear voltage proportional to their RPM and can provide the Focus
3 with exact motor speed feedback information. With good DC tachometers up to 0.5%
speed accuracy can be achieved. AC tach’s are not as accurate as DC tach’s but DC
tach’s require brush maintenance whereas the AC tach has no brushes.

Tach failure will typically result in motor speed runaway. One who designs

systems with Speed Feedback devices such as DC tachometers should be

cognizant of this fault condition and must take machine design precautions

We would recommend that all DC Drives be initially run using Armature Voltage
Feedback to verify operation even if Tach Feedback is the ultimate goal.

Quick Stops

A non-regenerative drive cannot stop a motor faster than the motors normal coasting
rate unless a Dynamic Braking resistor is employed. The DB option provides a rather
quick stopping action and provides motor turning resistance when the drive is not in the
RUN condition. The Focus 3N can be outfitted with a Dynamic Braking resistor should
this requirement be desired.

Power Outages

Shunt Wound Motors

Should a power outage occur, the drive would turn off and the motor would coast to rest.
If a Dynamic Braking resistor were employed there would typically be enough decaying
field strength to enable some faster stopping action.

should this event occur.

Note: DB Resistors require Contactor Option - See Options

Permanent Magnet Motors

Should a power outage occur, the drive would turn off and the motor would coast to rest.
If a Dynamic Braking resistor were employed, full Dynamic Braking force would be
exerted because the field is maintained by the motors internal permanent magnets.
Therefore, there would be motor turning resistance during power outages as well.

Page 7

General Information

r

Introduction

The purpose of this manual is to provide the user with the information needed to
install, start-up, and maintain the Focus 3 drive. This instruction manual should be read
in its entirety, paying special attention to the warning and caution notices, before
installation and before performing any start-up or drive maintenance.

Receiving

The user is responsible for inspecting the equipment thoroughly before accepting
the shipment from the freight company. Check the items received against the purchase
order. If any items are obviously damaged, do not accept delivery until the damage has
been noted on the freight paperwork.

Inspection

Before installation and start-up of the drive, inspect the unit for mechanical integrity
(i.e. loose parts, wires, etc). If physical damage was sustained during shipment, leave
the shipping container intact and notify the freight agent. After unpacking, check the
drive nameplate catalog number against the purchase order. See page 10 for
nameplate location.

Storing

Store the drive in its shipping container prior to installation. If the drive isn’t used
for a period of time, store according to the following instructions in order to maintain
warranty coverage:

Clean, dry location

Ambient Temperature Range: -400C to 700C

Humidity: 95%, Non-condensing

Improper procedures can result in personal injury or equipment damage. Only
qualified electrical maintenance technicians familiar with electronic drives and thei
standard safety precautions should be permitted to install, start-up, or maintain this
apparatus.

Page 8

PERFORMANCE FEATURES

r

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e

• Solid State Full Wave Power Bridge -Uses generously rated power semiconductors for
Maximum reliability and long life.

• Inner Current Loop Regulator - Inherent high bandwidth capability for fast response.

• Semiconductor Fusing - Both AC lines fused for maximum protection in case of short

circuit.

• AC Line Filter and Transient Voltage Suppressor Network - Eliminates interaction

between other drives or AC equipment.

• Current Limit Ranges - Selectable current limit ranges to match the drive to the motor

being used. Provides smooth acceleration of high inertia loads.

• Speed Regulator - 1 % accuracy armature voltage feedback with IR compensation or 0.5 %

accuracy with DC tachometer feedback. Regulation accuracy may be affected by the
tachometer selected.

• Current (Torque) Regulator -

2% accuracy armature current regulator allows the user to control motor torque instead of
speed.

• Circuit Board Indicators - Light emitting diodes (LEDs) on the control board indicate when

the drive is in Run Mode or the Current Limit is enabled.

• Remote Current Limit - Available by the simple addition of a potentiometer.

• Current Signal Follower lnput* - Allows the motor speed to be controlled by a current

signal from a commercially available transducer. The signal may be one of the following:

1 -5mA or 4-20mA

• Voltage Signal Follower lnput* - Allows the motor speed to be controlled by a voltage

signal from a DC tachometer generator or a process voltage signal. It accepts an input with
a range of 0-200 Vdc.

• Auto/Manual Operation - Standard circuitry allows the drive to be controlled by the

operator speed potentiometer or by the current/voltage signal inputs.

• UL/cUL - All Focus 3 Drives are UL/cUL listed.

*Use voltage or current input

• The current/voltage signal must be ungrounded and isolated from the AC powe

source and other controls which use the signal. If the signal is not isolated, an

isolator (such as #F3NSBD) must be used or drive damage will occur.

• One cannot make a connection to ground or a grounded device to any terminal o

connection point to the Focus 3 Non-Regenerative Drive without causing driv
damage. Such failures unfortunately cannot be warranted.

• See Ways of Achieving Isolation on page 69 of this manual

Page 9

The Focus 3 comes in two basic model variations- with and without enclosure.

Chassis Model

The model without an enclosure is denoted as a chassis model. The chassis model is
intended for mounting within a User supplied cabinet and where the User intends to
provide remote Start/Stop and Speed control signals.

Enclosed Model

The Enclosed version comes to you already in a NEMA 4/12 enclosure that would allow
the User to mount the Focus on a wall or machine surface. The Enclosed version has
Start/Stop and the Speed Control adjustment on the front cover for convenient operation.

Nameplate Information

Enclosed Unit

Model #

Model Number Definition

F3 N 2 C

Part #

Serial #

Enclosure

Chassis (C)
Enclosed (E)

Max HP Rating @240vac

2 HP (2)
5 HP (5)

Non-Regen (N)
Regen (R)

Drive Family

Focus 3 (F3)

Always record the drive Model Number, Part Number and Serial Number for future
warranty situations and spare parts. A good location to record these is on the Start-up

Guide Worksheet on page #49.

Page 10

Chassis Models

Enclosed Models

F3N2C

F3N2E

F3N5E

F3N5C

Specifications

Ratings

Input

AC

Catalog Enclosure HP 1Ø Max

Part #

F3N2C Chassis ¼ -1

½-2

F3N2E NEMA 4/12 ¼ -1

½-2
F3N5C Chassis 3-5 240 35 180 25 200 1
F3N5E NEMA 4/12 3-5 240 35 180 25 200 1

Volts Amps Volts Amps Volts Amps

120
240
120
240

14
14
14
14

Armature

DC Output

90

180

90

180

Armature Field Field

10
10
10
10

100
200
100
200

1
1
1
1

Page 11

PERFORMANCE SPECIFICATIONS

Service Factor 1.0
Speed Regulation (95% Load Change):
Armature Voltage 1% of Max. Speed with IR Compensation
All other variables

(voltage regulated) 15% of Base Speed
Tachometer Feedback (DC) 0. 5% of Base Speed
Speed Range: 30:1
Efficiency:
Control Only 98%
Drive System (motor and control) 86% typically

DRIVE OPERATING CONDITIONS

Altitude (without derating) 3300Ft.
Ambient Temperature:

Chassis Models 0-550C ( 130° F )
Enclosed (NEMA 4/12) 0-400C ( 104° F )

INTERNAL ADJUSTMENTS (POTENTIOMETERS)

Potentiometer Function Range

Maximum Speed 80-120% of Rated Speed
Minimum Speed 0-30% of Maximum Speed
IR Compensation 0-20% of Rated Voltage
Current Limit 0-150% of Selected Range
Acceleration Time 0.3-20 seconds (linear)
Deceleration Time 0.3-20 seconds (linear)
Jog Speed 0-30% of Full Speed command
Speed Loop Offset Adjustable
Velocity Loop Stability Adjustable
Current Loop Stability Adjustable
Current Signal Follower Gain Adjustable
Velocity Signal Follower Gain Adjustable
Signal Follower Zero Bias Adjustable

CUSTOMER SELECTIONS (JUMPERS)

Function Range

Input Voltage 120/240Vac
Control Mode Speed / Torque
Current Feedback range High / Medium / Low / Xlow
Current Limit Pot Selector Local / Remote
Armature Voltage level 90 Vdc/180 Vdc
Optional “M” Contactor Yes/No
Tachometer Feedback High/Low
Speed Feedback Selector Armature / Tachometer
Line Frequency 50/ 60Hz

Page 12

OPERATOR FUNCTIONS

Chassis Enclosed

Speed Adjustment (Speed Pot) Standard Standard
Start/Stop Customer Supplied Standard
Auto/Manual Optional Optional
Run/Jog Optional Optional

CONTROL CIRCUIT SPECIFICATIONS

Logic Control Power 24 Vdc

Speed Potentiometer 5000 ohms

Input Signal Requirement 10 Vdc @ 0.5mA

Control Circuit Isolation Optional with non-regen F3N models

Standard with regen F3R models

Current Signal Follower 1-5mA or 4 - 20mA

Voltage Signal Follower 10 – 200 Vdc (at Maximum Speed)

FOCUS 3 OPTIONS

CATALOG
NUMBER DESCRIPTION

F3SE Enclosure Small (2HP), NEMA 4/12
F3LE Kits Large (5HP), NEMA 4/12

F3M112 “M” ¼ - 1HP @ 120V
F3M224 Contactor ½ - 2HP @ 240V
F3M524 Kits 3 - 5HP @ 240V
F3DB224 ½ HP @ 120V, 2HP @ 240V
F3DB1524 ¼ - 1/3 HP @ 120V, I .5HP @ 240V

F3DB124 Dynamic ¾ -1HP @ 240V
F3DB0524 Braking ½ HP @ 240V
F3DB112 Kits ¾ -1HP @ 120V
F3DB324 3HP @ 240V
F3DB524 5HP @ 240V

F3TS Toggle Switch, NEMA 4 /12
F3NSBD Signal Isolation Board
2450-9024 Remote Percent Speed Meter Kit
2450-9021 Remote RPM Speed Meter Kit
2950-9066 Remote Operator Station ( 3 Function )
2950-9068 Remote Operator Station ( 5 Function )
6160-9001 Ten-Turn Precision Potentiometer

Page 13

Focus 3 Chassis Dimensions

Chassis

Suitable for mounting in a user’s enclosure where internal temperatures will not exceed
550C.

TB2

2

3

4

5

6

SMALL
REGEN

&

NON-REGEN

MOUNTING

9.75" 9.35"

7

8

9

10

11

12

13

14

15

16

17

18

19

20

B

D

B

C

C

A

A

E

JP11

8

1

T1

3.30"

AC1 AC2

0.25"

13.00"

12.00"

B B

1

LAL

0.168" (4 PLACES)

F3N2C

6.36"

6.75"

TB2

2

3

4

LARGE
REGEN
&

NON-REGEN

MOUNTING

A

TB1

2

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

B

D

B

C
C

A

A

E

JP11

8

1

4.50"

AC2 G2

0.13"

Page 14

8.88"

9.50"

0.312" (4 PLACES)

F3N5C

Focus 3 Enclosed Dimensions

NEMA 4/12

Suitable for most well ventilated factory areas where industrial equipment is installed.
Locations subject to steam vapors, oil vapors, flammable or combustible vapors,
chemical fumes, and corrosive gases or liquids should be avoided unless an
appropriate enclosure has been supplied. Ambient temperature is not to exceed 400C.

5.93

9.35

4.63

12.00

6.36

8.88

0.168 Dia
(4 Places)

6.91

0.51

6.13

F3N2E

3.70

9.50

2.102.22

1.05

1.05

0.13

1.05

Ø0.31

F3N5E

Page 15

Focus 3 Option Kits

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Focus 3 Enclosure Option – F3SE (small) up to 2HP

F3LE (large) 3-5HP

This kit provides the flexibility of stocking only Chassis
drives and adding the enclosure when required. It
reduces the number of stocked items to 6 (four chassis
drives and two covers) as opposed to eight (fou
enclosed drives and four chassis drives). It includes the
speed adjustment potentiometer and the start/stop
switch pre-wired to a plug-on terminal strip and all seals
to provide a NEMA 4/12-enclosure rating.

Focus 3 Contactor Kit – P/N F3M112 (1 HP,120vac)

P/N F3M224 (2 HP, 240vac)

This Kit includes a magnetic contactor that can be
mounted either in the Focus 3 enclosed unit or on the
chassis mount unit. It provides a positive disconnect o
the motor armature when the controller is stopped,
preventing motor rotation in the event of SCR mis-fire
due to line noise. This kit may also be required by local
and/or National Electrical Codes. This kit also includes
the DB (dynamic braking) poles, an auxiliary normally
open contact and all connection wires.

Page 16

Focus 3 Contactor Kit– P/N F3M524 (3-5 HP, 240vac)

This Kit includes a magnetic contactor that can be
mounted either in the Focus 3 enclosed unit or on the
chassis mount unit. It provides a positive disconnect o
the motor armature when the controller is stopped,
preventing motor rotation in the event of SCR mis-fire
due to line noise. This kit may also be required by local
and/or National Electrical Codes. This kit also includes
the DB (dynamic braking) poles, an auxiliary normally
open contact and all connection wires.

Focus 3 Option Kits

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AC Input HP (Typical) Part Number

120 Vac

240 Vac

Focus 3 Dynamic Braking Kit
PN– See Table Below

For use with Focus 3 Contactor Kits. Dynamic
braking provides rapid motor stopping by quickly
dissipating the stored energy in the rotating moto
and load. These resistors have been sized in
accordance with Nema specifications for dynamic
braking.

“Providing 3 stops in rapid succession with the
load inertia equal to the motor inertia, then
cooling forever.”

Note: Large and small dynamic braking resistors
shown, ¼-2 HP use small and the 3-5 HP use the
large resistor.

1/4-1/3

1/2

3/4-1

1/2

3/4-1

1.5
2
3
5

F3DB1524

F3DB224
F3DB112

F3DB0524

F3DB224

F3DB1524

F3DB224
F3DB324
F3DB524

Focus 3 Toggle Switch – P/N F3TS

This kit can be mounted in the drive enclosure cove
or remote mounted when used with chassis drives.
The kit includes the switch, NEMA 4/12 switch boot
and the connection wires for enclosure use. It is
used to provide one of the following functions:
Fwd/Rev, Run/Jog, or Auto/Manual. Up to 3 o
these kits may be used with the Drive cover.

Page 17

Focus 3 Option Kits

AC Tachometer Input Board – P/N F3ACT

This option kit allows the Focus 3 to accept AC
tachometer feedback. It mounts directly to the focus
pc board and accommodates a range from 45 to
110vac at maximum speed.

Signal Isolator Board – P/N F3NSBD

This option is used in applications where isolation is
required between an external control signal and the
motor controller (which may or may not be at earth
ground potential). It can be utilized to isolate a variety
of voltage or current signals (see specifications below).
It may also be used simply to isolate the speed
adjustment pot, and the pot power supply is included.
This option can be mounted in the enclosure or in a
piece of plastic track (included with kit).

Specifications:

Input Power: 17- 30 Vdc @ 50mA Max. (for control circuitry)

Control Relay (CRR): 24 Vdc @ 12.1 mA (JP5 = 24 Vdc)

120 Vac @ 20 mA (JP5 = 120 Vac)
Contact Type/Rating – 2 Form A / 1A @ 250 Vac

Isolation Voltage: 240 Vac Power Systems

2000 Vac Hi-Pot for 1 Minute

Inputs:

Voltage Ranges: 5,12,26,52,98 & 208 Vdc, 180 Ohms/volt

Current Ranges: 0-5 mA, 1-5 mA, 910 Ohms input impedance

0-20 mA, 4-20 mA, 250 Ohms input impedance

Speed Pot: 5Kohms, 2W (Includes +10 Vdc power supply for potentiometer)

Output: 0 to +10 Vdc (Uni-polar)

Page 18

Focus Family Options

r

Speed

Remote Operator Station – P/N 2950-9068 /2950-9066

Run
Jog

Auto
Man

Start

Stop

Speed

Start

Stop

These NEMA 1 operator stations can be used to remotely
control Focus 1 and Focus 3 Motor Controllers. Two models
are available as shown. Both units include a Speed
Potentiometer, a green normally open start button and a red
normally closed stop button. The 2450-9068 also includes
two two- position switches with two contacts, 1 normally
open, 1 normally closed.

Remote Percent Speed Meter – P/N 2450-9024

This meter may be used to remotely display the motor speed
in percent of maximum speed. Included is a universal
calibration board. The 4 1/2-inch meter is mounted in a NEMA
1 wall mountable steel enclosure.

Remote RPM Speed Meter – P/N 2450-9021

This meter may be used to remotely display the motor RPM
(up to 2000rpm). Included is a universal calibration board. The
4-1/2inch meter is mounted in a NEMA 1 wall mountable steel
enclosure.

Ten-Turn Precision Speed Potentiometer – P/N 6160-9001

This is a multi-turn speed potentiometer. It provides a vernie
scale for precise and repeatable speed setting. A locking tab is
provided to prevent in advertent speed changes. It may be
mounted in either of the Focus 1 and Focus 3 enclosures or the
Remote Operator Station described above.

Page 19